Most forms of rat poisons. Read the manufacturer's label carefully for proper usage and storage.

Most herbicides made for residential use are generally considered to be safe for use in environments where animals frequent, as long as the label instructions are followed exactly. For example, if a weed killer spray label states, "Keep animals away from treated areas until dry," it is important to adhere to these instructions in order to avoid problems. If these instructions are not followed, affected animals might exhibit such symptoms as mild skin or gastrointestinal irritation, or the desirable vegetation could be damaged from unintentional spread of the herbicide.​

Cocoa MulchFound in most home garden centers, cocoa mulch is known for its sweet chocolate smell and fine texture. Cocoa mulch contains theobromine and caffeine, 2 key ingredients in chocolate. From the ASPCA:What happens if a 50 pound dog eats cocoa mulch?